Type-writing machine.



J. G; DUANE.

TYPE WRITING MACHINE.

APPLICATION FILED JUNE 19, 1909.

E 9 g m 4415 Patented Sept. 21, 1909.

a A TTO RN: 1'1

' I provide each trip with a sprin which' returns the trip after the d sengage Jenn 0. means, or nanrronnromirnerrcur, .essrenoa 'ro onnnawoon TYPE- warrna comrenv, or new verse, 1:. Y., a CORPORATIQN or new messwee-wanna Maoiiiiri'si @ZMAHEL T all whom it may concern:

Be it known that 1, J HN G. Donna, a citizen of the United Statesyresiding in Hartford, 1n the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Type-Vi riting Ma.-

mounted on said shaft, to move alternately into engagement 'with trips. The latter,

however, are normally held away from thewheels by ribbon-controlled devices.' When either ribbon is unwound from its spool its associated'tr'ip is permitted tofall into engagement with its trip wheel, and as the latter revolves there is effected an endwise shifting movement of the driving shaft, whereby the direction of the winding of the ribbon.

is reversed. I

The object of the present invention is to providemeans to avoid the liability of both trip wheels becoming simultaneously engaged with "their trips and thereby locking the mechanism against action.

device,

ment of the latter from its trip wheel. The spring device does not return the trip en-'- tirely to normal position, but holds the trip so far away from the trip-Wheel'that' there is no danger of accidental engagement and locking. lhe final portion of the return movement of each trip to normal position is effected by the ribbon-controlled device. When therefore the spool becomes empty, its trip is released and permitted to fall ini'c engagement with the wheel independently of-its spring-returning device. The revolving trip wheel thereupon swings the trip still farther in the same direction against the tension of said spring-returning device. This swinging action of the'tri'p wheel in engagement with the revolving wheel causes the latter to travel in axial direction to gether with the main driving shaft, until the reversing of the ribbon-Windingmechanism is effected. The returning spring forthe other trip holds the latter away from its as- Specification oi Letters ?atcnt. Pg'mgnteii Application ties June 19, lacs. semi No. 03,554.

havin To this end. I

Sept. 21, 1909.

sociated'trip wheel, so that liability of both trips being simultaneously in engagement with their wheels is avoided. I N

In the accompanying drawings, Figure 1 is a rearperspective View of the ribbon reversing mechanism of an Underwood front strike writing machine, embodying the present improvements, Fig. Qis a ront View of thetrippin devices associated withthe right hand rib b'onvspool and showing the parts in normal positions. Fig. 3 is a view similar to Fig. 2, but showing the trip as been permitted. by the ribbon-con- 3 'trollet dejv'ice to'swing into engagement with the trip-wheel. Fig. l isa similar view showing the trip as having'b'een forced farther around its pivot from the Fig. 3 position; this movement being accomplished by the trip wheelfwhich at the same time is forced in axial directiomto shift the trans verse drivingshaft from' one spool to the other. This movement of the trip is ef-' fected against thetension of its returning spring. Fig. 5 is a viewsimilar to Fig. 2,

but showin'gfthe driving shaft as having shifted to reverse the winding of the ribbon, and the trip as having been moved back toward normal position in advance of the return of the ribbon-controlled device to normal position.

The types strike/rcarwardly through a ribbon 1, which is carried upon a vibrator 2 on vertical shafts 5, 6 having pinions .7, 8, to mesh with pinion's 9, 10 carried upon a horizontal shiftable transverse driving shaft 11, the latter having a ratchet wheel 12 and operated by a pawl 13, which is driven by a between spools 3 4. Said spools are mounted bon therefore causes said obstruction to q swin an arm 1 5 upon which said eye 16 is rov ded; said arm fixed upon a vertical rock shaft 16. having at its lower end a forwardly extendingarm 17. Said arm 17 is held in normal position by a spring 18 coiled aboutthe shaft 16, and said arm is normally in engagement with ashoulder 19 provided on a trip 20,.the latter pivoted at 21 upon the framework. The movement of the arm 15 eifected by the obstruction 16 causds the arm 17 to swing from the Fig. 2 position away from the trip, as at Fig. 3, permitting beveled collar 23 thereon. A spring-pressed point 24 is forced up over and past the apex of the double bevel, and then reacts to force the driving shaft 11 still farther toward the right, as at Figi 5. At this final motion of the driving shaft, the trip wheel 22 springs away from the trip 20, and the latter is swung up nearly to normal position by a.

lever 25 pivoted at 26 upon the framework and operated by a compression spring 27 This return movement of the pawl is effected before the ribbon begins to rewind upon the empty spool. During such rewinding movement the obstruction 16*.is withdrawn from the eyel6 on the arm 15, and the spring'l8 returns the reels shaft 16 and. .the parts thereon to normal positions;' the arm, 17 swinging from the position at Fig. 5 to that at Fig. 2, and again lifting the trip 20 the remainingdistance to normal position.

It will be seen at Figs. 2, 3 and 5 that the spring 27 presses a stop 28 on-ithe lever 25 against a fixed bracket 25) of the framework, so that said lever cannot oppose the gravitation of the trip from the position at Fig. 2 to that at Fig. 3, whereby the trip originally engages the trip wheel 22. It will be understood however that the inactive trip 20 cannot fall independently beyond the position indicated at Fig. 5, and hence cannot reach the inactive trip wheel; so that when the reversing mechanism is in operation at one side of the typewriting machine, it is impossible for the tri at the op osite side of the machine to fall accidentalfiy into engagement ,with its trip wheel. his is of special advantage when the ribbon is being wound by hand, by means of the usual crank or handle 30, Fig. 1-.

Having thus described my invention, I claim: I

1. In a ribbon-reversing mechanism, the combination with spool shafts and a transverse shiftable driving shaft, the latter provided with alternately effective trip wheels, of trips to cooperate with said wheels to shift the driving shaft to and fro, and ribbon-controlled meansto hold the trips away fromthe wheels; each trip provided with a device for returning it .toward normal position after disengagement with the trip wheel and before the return of said ribbon-controlled device to normal positign; means beingprovided to limit theaction of said returnmg device, so that the return of the trip to normal position may be completed by said.

shift the driving shaft to and fro, and ribhon-controlled means to hold the tri s away from the wheels; each trip provide with a device for returning it toward normal position after disengagement with the trip wheel a'ndgbeforethe return of said ribbon-controlled deviceto normal position; means being provided to limit the action of said returning device, so that the return of 'the trip to normal position may be completed by said ribbon-controlled means; the latter having sufficient control over the trip to cause it' to drop into engagement with its wheel at the ribbon-reversing o oration, independently of said returning evice; said returning device comprising a lever having a spring and a stop.

3. In a ribbon-reversing mechanism, the combination with a shiftable ribbon-driving shaft having trip wheels thereon, of trips to cooperate with said wheels to shift said shaft to and fro, ribbon-controlled means to,

hold the trips normally away from the wheels; said ribbon-controlled means including devices called into operation when either spool becomes empty, for causing the trip associated with the empty spool to drop into engagement with its associated trip-wheel to effect the shifting of said driving shaft;-

means being provided to complete the shifting movement of the driving shaft. indeuendently of the trip; and means to return said trip toward normal position in advance of the return movement. of said ribbon-controlled devices to normal positions.

" JoHN 0. Down.

\Vitnesses:

\V. M. BYQRKM/AN',

LYMAN D. BnoUon'roN.

Hit) 

